[719] in java-interest
Re: Threads and select ()
daemon@ATHENA.MIT.EDU (Jonathan Payne)
Mon Jul 17 16:10:19 1995
Date: Mon, 17 Jul 1995 11:26:05 -0700
From: jpayne@starwave.com (Jonathan Payne)
To: arista@art.redstar.com
Cc: java-interest@java.Eng.Sun.COM, arista@art.redstar.com
In-Reply-To: <199507171558.LAA02925@art.redstar.com> (message from Nathan Abramson on Mon, 17 Jul 1995 11:56:28 -0400)
> From: Nathan Abramson <arista@art.redstar.com>
> Date: Mon, 17 Jul 1995 11:56:28 -0400
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> Maybe someone could help me out with a couple of questions I have
> regarding Threads...
>
> 1) Is the thread multitasking preemptive, or cooperative? The "synchronized"
> keyword seems to imply preemptive threading, but then the "yield ()"
> function seems to imply that the programmer has to explicitly give
> control to another thread (which I found to be the case). If the
> latter is true, why? Shouldn't an interpreter be able to handle
> preemptive multithreading?
Higher priority threads preempt lower priority ones. Threads at the
same priority do not preempt, so that's why yield() is there.
> 2) There is a function to put a thread to sleep for a certain length of
> time. But is there a way for a thread to sleep while waiting for
> file descriptor activity, ala UNIX select ()? If not, is there a
> way to make a network server or other event-driven application based
> on file descriptors run without the dreaded load of "1.00" when idle?
You can block on read(), which implies a separate thread for each
socket. Which may or may not be bad depending one what you're trying
to do.
I wanted to implement select() a while ago and mentioned it to the
java team but they blew me off, so I blew it off.
> Nathan Abramson
> Art Technology Group
>
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